Marin Luther King's signature is on a 1965 one-page typewritten letter Wednesday, April 3, 2013, near Philadelphia. The Raab Collection, a dealer of rare historic documents is selling the letter from Martin Luther King Jr. to Philadelphia police officer Sgt. James Adair who was assigned to protect him, expressing gratitude for the officer's concerns and minimizing his own worries for his personal safety. (AP Photo/Matt Rourke)

Associated Press
Marin Luther King's signature is on a 1965 one-page typewritten letter  Wednesday, April 3, 2013, near Philadelphia.  The Raab Collection, a dealer of rare historic documents is selling the letter from Martin Luther King Jr. to Philadelphia police officer Sgt. James Adair who was assigned to protect him, expressing gratitude for the officer's concerns and minimizing his own worries for his personal safety.  (AP Photo/Matt Rourke)
Marin Luther King's signature is on a 1965 one-page typewritten letter Wednesday, April 3, 2013, near Philadelphia. The Raab Collection, a dealer of rare historic documents is selling the letter from Martin Luther King Jr. to Philadelphia police officer Sgt. James Adair who was assigned to protect him, expressing gratitude for the officer's concerns and minimizing his own worries for his personal safety. (AP Photo/Matt Rourke)
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